Why don't my ' Live 'pics move when used as wallpapers

Now unless I'm very much mistaken , when you take a ' Live ' photo , & then use it as your homescreen , shouldn't this then ' move ' when you press your screen.

Now when I take a pic with this switched on , it then moves as it should when viewed in my camera roll.

The thing is , if I then select this same pic & use it as my homescreen , it will not ' come alive ' as they should. Likewise , if I select one of the new stock live wallpapers on my homescreen , when I press on them they don't move.

Am I missing something here , should I have something switched on for this to work ?

I have a lovely live pic of my daughter laughing , & although it moves as should when viewed via camera roll , it doesn't do anything other than act as a normal pic when used as a wallpaper.

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